2010 Pennsylvania Code
Title 66 - PUBLIC UTILITIES
Chapter 3 - Public Utility Commission
312 - Privilege and immunity.

     § 312.  Privilege and immunity.
        No person shall be excused from testifying or from producing
     any book, document, paper, or account in any investigation or
     inquiry by, or hearing before, the commission or its
     representative, when ordered to do so, upon the ground that the
     testimony or evidence, book, document, paper, or account
     required may tend to incriminate him or subject him to penalty
     or forfeiture. No person shall be prosecuted, punished, or
     subjected to any forfeiture or penalty for or on account of any
     act, transaction, matter, or thing concerning which he shall
     have been compelled, under objection, to testify or produce
     documentary evidence. No person so testifying shall be exempt
     from prosecution or punishment for any perjury committed by him
     in his testimony.